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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf18a92584351848307c7123c1482d2f38bd22ca6eac0ac50ed28d941550a54' 
  AND token = '2KzZQ4jxGQvDTeDXNFXqvjyOp6xLt1EMqo7slo17uyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}